KR19990001342A - Low Cost ABS and TCS Integrated Modulator - Google Patents

Abstract

The present invention seeks to provide a low cost integrated modulator that allows TCS functionality to be integrated with the addition of simple components to the ABS.

The present invention is connected to the booster 14 and the master cylinder 15 for generating hydraulic pressure during the operation of the brake pedal 13, the oil tank 16 for supplying and withdrawing oil during the TCS operation, and the master cylinder 15 Mode switching solenoid (1) installed in the first flow path (a) and opened and switched according to ABS and TCS, and installed in the second and third flow paths (b) (c) to control the hydraulic wheels to control both wheels (4a, 4b) High-pressure shut-off solenoid valves 2a and 2b for opening and closing the flow of the vehicle, wheel speed sensors 5a and 5b mounted to the wheels 4a and 4b so as to sense slippage of the wheels 4a and 4b during braking; To accumulate the hydraulic pressure of the low pressure blocking solenoids 3a and 3b installed on the five flow paths d and e and the wheels 4a and 4b guided by the low pressure blocking solenoids 3a and 3b. A low pressure accumulator 6, a check valve 8 connected to the sixth flow path f so as to be integral with the low pressure accumulator 6 and to function as a pilot valve, and the low pressure accumulator High pressure pump (7) for discharging the hydraulic pressure flowing from the data (6) at high pressure, and a buffer chamber (9) provided on the first flow path (a) to reduce the pulsation of the high pressure discharged from the high pressure pump (7) ) And orifice (10), the check valve (11) to prevent the hydraulic pressure passing through the orifice (10) and the first flow path (a) and the sixth flow path (f) is connected between the It consists of a relief valve 12 to maintain a constant hydraulic pressure flowing in one passage (a).

Description

Low Cost ABS and TCS Integrated Modulator

Since a vehicle is provided with a braking device for braking a vehicle that is driven by a driver's need, an intelligent braking device has recently been proposed in which a vehicle can be braked more stably in connection with an electronic controller.

Among them, a representative intelligent braking device is an anti-lock brake system (hereinafter referred to as ABS) that prevents slippage of the wheel during braking.

As shown in FIG. 1 and FIG. 2, this ABS is generally composed of a master cylinder 100, a solenoid 200 and a flow regulating valve 300, a piston pump 400, and a brake 500. Consists of.

In the conventional ABS having such a configuration, the plunger 220 blocks the flow path 240 through the spring 210 to the piston pump 400 in a normal state, that is, no sliding occurs, and thus, in the master cylinder 100, The generated hydraulic pressure is directly transmitted to the brake 500 through the spool 320 and the flow path 340 in the flow regulating valve 300 to perform braking, and when the slip rate is increased to decrease the braking pressure, the controller 600 is required. ) To supply the current to the solenoid 200 to lift the valve head 230 to open the flow path 240 between the flow control valve 300 and the piston pump 400 to operate the piston pump 400.

At this time, since the pressure of the pressure chamber 330 connected to the flow path 240 to the piston pump 400 is reduced by the operation of the piston pump 400, the spool 320 is applied to the force of the spring 310 as shown in FIG. Win and move to the left to block the brake 500 and the master cylinder 100, the brake 500 and the flow path 240 is connected to the pressure of the brake 500 is reduced.

When the pressure decreases continuously and the slip ratio of the wheel 700 falls below a prescribed value, the current supply to the solenoid 200 is stopped so that the flow control valve 300 is connected from the brake 500 to the piston pump 400. The spool 320 starts to move to the right again by blocking the flow path 240 to recover the pressure in the pressure chamber 330.

At this time, the spool 320 is moved only to the moment when the flow path 350 is opened, and the pressure of both ends of the orifice 360 and the force of the spring 310 are in a position where the pressure is balanced, and the size of the orifice 360 and the orifice Since the flow rate supplied to the brake 500 is constant due to the pressure difference that is kept constant in the two chambers with the 360 interposed therebetween, the rate of increase in the brake 500 is adjusted.

If this pressure increase continues and the pressure of the brake 500 becomes equal to the pressure of the master cylinder 100, as the balance between both ends of the spool 320 is lost, the spool 320 is moved to the right again, thereby becoming a normal braking state. .

When the pressure needs to be reduced again during the pressure increase state, the solenoid 200 is operated to return to the pressure decrease state so that the pressure of the brake 500 can be properly adjusted.

As described above, in general ABS, the driver presses the brake pedal 800 to press the brake unit by hydraulic pressure to give a braking force, so that the locking phenomenon of the wheel 700 occurs due to a sudden braking force, so that the sliding of the vehicle does not occur. By adjusting the hydraulic pressure to press the braking unit, by releasing and winding the braking force acting on the wheel 700 continuously so that the vehicle can be stopped safely.

However, the ABS is for the purpose of improving the stability of the braking and the riding comfort by controlling the braking pressure of the hydraulic brake to prevent slippage of the wheel 700 during braking. In order to reduce driving wheel slip due to excessive driving force by automatically controlling the driving force of the brake 500 without the driver's pedal operation, and to obtain proper friction force with the road surface, to improve driving stability by ensuring the straight stability and steering performance of the vehicle. A separate driving force control system (hereinafter referred to as TCS) had to be provided.

However, when a separate driving force control device is installed, the cost increases and, as a result, the charge space for mounting is large, there is a problem in the case of a small vehicle in terms of cost or charge space.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and to provide a low-cost miniaturized modulator while increasing braking stability of a vehicle by integrating a TCS function by adding a simple component to the ABS.

In order to achieve the above object, the present invention provides a booster and a master cylinder for generating hydraulic pressure during operation of the brake pedal, an oil tank filled with hydraulic oil and supplying and recovering oil during TCS operation, and installed in a first flow path connected to the master cylinder. Mode switching solenoid which is opened and closed according to ABS and TCS, high pressure blocking solenoid which is installed in the second and third flow paths to open and close the flow of hydraulic pressure to control the wheels on both sides, and detects the slip of the wheel during braking Wheel speed sensor installed on the wheel to send the signal to the ECU to operate the ABS, low pressure blocking solenoid opened during ABS operation on the fourth and fifth euros connected to the second and third euros, and the wheel guided by the low pressure blocking solenoid A low pressure accumulator for accumulating the hydraulic pressure of the gas and a sixth flow path connected to the sixth flow passage so as to be integrated with the low pressure accumulator and function as a pilot valve. A high pressure pump for supplying hydraulic pressure to brake the wheel by discharging the hydraulic pressure flowing from the low pressure accumulator at high pressure, and a high pressure pump discharged from the high pressure pump to reduce the pulsation of the high pressure. Buffer valve and orifice, check valve to prevent the hydraulic pressure passing through the orifice back flow, and relief valve connected between the first and sixth flow path to maintain a constant hydraulic flow in the first flow path during the TCS operation Characterized in that configured.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the configuration and operation effects as follows.

1 and 2 is an operation state diagram of a conventional vehicle anti-skid device (ABS)

3 is a block diagram of an ABS / TCS integrated modulator to which the present invention is applied.

* Description of the symbols for the main parts of the drawings *

One ; Mode switching solenoids 2a, 2b; High pressure solenoid

3a, 3b; Low pressure blocking solenoids 4a, 4b, and 700; Wheel

5a, 5b; Wheel speed sensor 6; Low Pressure Accumulator

6a: piston 8; Check valve

7: high pressure pump 8a; Checkball

8b; Pin 9; Buffer chamber

10,360; Orifice 11; Check valve

12; Relief valves 13,800; Brake pedal

4 ; Boosters 15,100; Master cylinder

16; Oil tank a; First euro b; 2nd euro

c; Third euro d; Euro 4

e; The fifth euro f; 6th euro

240,340,350; Euro 200; Solenoid

220; Plunger 230; Valve head

300; Flow control valve 320; spool

330; Pressure chamber 400; Piston pump

500; Brake 600; Controller

3 is a block diagram of a braking device incorporating an ABS / TCS to which the present invention is applied. The present invention provides a booster 14 and a master cylinder 15 for generating hydraulic pressure when the brake pedal 13 is operated, and the hydraulic fluid is filled. And the oil tank 16 for supplying and recovering oil during TCS operation, the first channel a connected to the master cylinder 15, and the mode switching solenoid 1 for opening and closing according to ABS and TCS. Slips of high pressure shut-off solenoid valves 2a and 2b which are installed in the second and third flow paths b and c to open and close the flow of hydraulic pressure to control both wheels 4a and 4b, and the brakes 4a and 4b during braking. Is connected to the wheel speed sensors 5a and 5b installed on the wheels 4a and 4b and the second and third flow paths b and c to send a signal to the electronic control device (not shown). The low pressure blocking solenoids 3a and 3b installed on the fourth and fifth flow paths d and e and opened during ABS operation, and the wheels 4a and 4b guided by the low pressure blocking solenoids 3a and 3b. A low pressure accumulator 6 for accumulating hydraulic pressure, a check valve 8 connected to the sixth flow path f so as to be integral with the low pressure accumulator 6 and to serve as a pilot valve; A high pressure pump 7 for discharging the hydraulic pressure flowing from the cumulator 6 at a high pressure, and a buffer chamber provided on the first flow path a to reduce pulsation of the high pressure discharged from the high pressure pump 7 ( 9) and orifice 10, the check valve 11 to prevent the high pressure hydraulic pressure passing through the orifice 10, and is connected between the first flow path (a) and the sixth flow path (f) TCS It consists of a relief valve 12 to maintain a constant hydraulic pressure flowing in the first flow path (a) during operation.

In the above configuration, the mode switching solenoid 1 is controlled by the electronic controller whether or not to open or close the valve according to whether ABS or TCS is operated. That is, in ABS operation, the mode switching solenoid 1 is opened so that the hydraulic pressure of the master cylinder 15 is supplied to the wheels 4b through the first flow path a and the third flow path c, and in the TCS operation. The mode switching solenoid 1 is cut off so that the hydraulic pressure is not supplied through the first flow path a.

Then, in integrating the low pressure accumulator 6 and the check valve 8, the check ball 8a of the check valve 8 is connected to the piston 6a of the low pressure accumulator 6 by a pin 8b. When the hydraulic pressure is accumulated and the piston 6a is lowered, the check valve 8 is shut off, and when the hydraulic pressure is not operated, the check valve 8 is resiliently driven by the spring 6b supporting the piston 6a. Will be opened. In addition, the check valve 8 is integrated with the low pressure accumulator 6 so as to function as a pilot valve.

Referring to the effects of the present invention configured as described above are as follows.

First, when describing the ABS operation process, when the driver presses the brake pedal 13, the hydraulic pressure is generated in the master cylinder 15, the hydraulic pressure is supplied to the second passage (b) via the first passage (a) And the remainder is respectively supplied to the third passage (c) through the mode switching solenoid (1), wherein the continuous progress of the hydraulic pressure to the first passage (a) is blocked by the check valve (11). In addition, the hydraulic pressure supplied to the second and third flow paths (b) and (c) is supplied to the wheels 4a and 4b through the high pressure blocking solenoids 2a and 2b, thereby decelerating and braking the vehicle speed.

However, when the wheels 4a and 4b are braked and the slip phenomenon occurs on the wheels 4a and 4b on a slippery road surface such as an ice plate by the driving force of the vehicle, the wheel speed sensors 5a and 5b detect this. The signal is sent to the electronic controller, which receives the signal and compares the input data with the pre-input data to determine the slippage of the wheels 4a and 4b. To this end, the electronic control device blocks the hydraulic action toward the master cylinder 15 of the high pressure blocking solenoids 2a and 2b and simultaneously opens the low pressure blocking solenoids 3a and 3b.

Then, the hydraulic pressure supplied to and acted on the wheels 4a and 4b passes through the low pressure blocking solenoids 3a and 3b, respectively, and is transferred to the low pressure accumulator 6 under the guidance of the fourth and fifth flow paths d and e. When the pressure of the wheels 4a and 4b is reduced, the braking pressure applied to the wheels 4a and 4b is reduced, so that the locking of the wheels 4a and 4b is temporarily stopped, thereby rotating again.

Since the vehicle stops only when the braking pressure is increased on the wheels 4a and 4b again, the electronic control unit opens the high pressure blocking solenoids 2a and 2b again at the same time and sets the low pressure blocking solenoids 3a and 3b. The hydraulic pressure accumulated in the low pressure accumulator 6 is sucked into the high pressure pump 7 and discharged to the high pressure hydraulic pressure by the pump operation. The discharged hydraulic pressure is guided by the first channel (a) and partly supplied to the third channel (c), and the other part is supplied to the second channel (b) via the mode switching solenoid (1) to perform the above-described process. The wheels 4a and 4b are braked again by being supplied to the wheels 4a and 4b.

Next, the TCS operation process will be described. When the driving wheel slips due to rapid acceleration, rapid start, etc. of the vehicle, the wheel speed sensors 5a and 5b installed on the wheels 4a and 4b detect this and transmit a signal to the electronic controller. The electronic controller receives the signal and compares the input data with the pre-input data to determine the slip of the wheels 4a and 4b, and according to the determination, the mode switching solenoid connected to the master cylinder 15 for the driving force control. At the same time as blocking (1), the high pressure pump (7) is operated to suck the oil filled in the oil tank (16).

That is, even if the driver does not step on the brake pedal 13, when the high pressure pump 7 is actuated, the oil in the oil tank 16 is drawn from the master cylinder 15 → the first passage a → the sixth passage f by the suction force. The suction valve is sucked into the high pressure pump 7 through the check valve 8 held open by the spring 6b of the low pressure accumulator 6).

The oil transferred to the high pressure pump 7 is discharged at a high pressure and is supplied to the third flow path c through the buffer chamber 9 → the orifice 10 → the check valve 11 → the first flow path a. (At this time, the mode switching solenoid 1 is cut off so that no hydraulic pressure is supplied to the second flow path b), and the hydraulic pressure supplied to the third flow path c passes through the high pressure blocking solenoids 2a and 2b and the wheel ( Since it is supplied to 4b), the driving force of the wheel 4b is reduced.

On the other hand, some of the high-pressure oil supplied to the first flow path (a) by the operation of the high pressure pump (7) flows into the third flow path (c) due to the exit to the sixth flow path (f) through the relief valve 12 The hydraulic pressure is supplied while maintaining a predetermined constant pressure to supply an appropriate braking pressure to the wheel (4b).

When the braking pressure is released, the mode switching solenoid 1 is opened by the electronic control unit, and the oil supplied to the wheel 4b for braking is the third channel (c) → the first channel (a) → Operation is completed by returning to the oil tank 16 via the mode switching solenoid 1.

As described above, the present invention integrates the TCS function by adding several parts to the ABS, thereby preventing slippage of the wheels 4a and 4b during braking, thereby improving the stability and riding comfort of the vehicle while the driver's pedaling during turning or rapid acceleration. By controlling the driving force of the brake automatically without manipulation, it is possible to reduce the slippage of the driving wheel due to excessive driving force, and to obtain the appropriate frictional force with the road surface, thereby improving the driving stability by ensuring the linear stability and steering performance of the vehicle.

In addition, if the braking system in which the ABS and the TCS are integrated is used for each of the front and rear four wheels of the vehicle, it is possible to implement a simple and compact low-cost CDC (Car Dynamic Control).

As described above, the present invention adds a mode switching solenoid to the anti-skid device ABS, a check valve integrated in the low pressure accumulator, and a relief valve to integrate the driving force control device TCS. It prevents slippage and improves braking stability and ride comfort, as well as automatically controlling the driving force of the brakes without the driver's pedaling during turning or rapid acceleration, ensuring proper frictional force with the road surface, ensuring the stability and steering performance of the vehicle. It is possible to improve the driving stability through the structure, the size is significantly reduced in the structural aspect is very convenient to manufacture at the same time, the cost is reduced, and the charge space is also significantly reduced, it is easy to install in small vehicles.

The present invention integrates a check valve and a relief valve integrated in a mode switching solenoid low pressure accumulator in an anti-skid device ABS to perform a function of a driving force control device TCS in a vehicle braking system. Is to provide a modulator.

Claims (2)

In the anti-skid device (ABS) and driving force control device (TCS) for improving the braking stability of the vehicle, The oil tank 16 for supplying and recovering oil during the TCS operation, the booster 14 and the master cylinder 15 for generating hydraulic pressure, and the mode installed in the first flow path a connected to the master cylinder 15 Of the switching solenoid 1, the second and third flow paths (b) and (c), the high-pressure cut-off solenoids 2a and 2b for controlling both wheels 4a and 4b, and the braking wheels 4a and 4b. Wheel speed sensors 5a and 5b installed on the wheels 4a and 4b to sense the slip and the fourth and fifth flow paths d and e connected to the second and third flow paths b and c. The shank is connected to the low pressure accumulator 6 and the sixth flow path f which accumulate the hydraulic pressure of the wheels 4a and 4b guided by the low pressure blocking solenoids 3a and 3b which are installed in the above and opened during ABS operation. A high pressure pump 7 for discharging the hydraulic pressure flowing from the valve 8, the low pressure accumulator 6 at a high pressure, and a first flow path to reduce the pulsation of the high pressure discharged from the high pressure pump 7 ( buffer installed on a) Burr (9) and orifice (10), check valve (11) for preventing the high pressure hydraulic pressure passing through the orifice (10), and the connection between the first flow path (a) and the sixth flow path (f) Low-pressure ABS and TCS integrated modulator, characterized in that consisting of a relief valve 12 to maintain a constant hydraulic pressure flowing in the first passage (a) during TCS operation. The check ball (8a) of the check valve (8) is pinned to the piston (6a) of the low pressure accumulator (6) when the low pressure accumulator (6) and the check valve (8) are integrated. Low cost ABS and TCS integrated modulator characterized in that it is connected to (8b) to function as a pilot valve.